{{Short description|Quasar in the constellation Coma Berenices}} {{Infobox galaxy|name=[[Third Cambridge Catalogue of Radio Sources|3C]] 287|epoch=[[J2000.0]]|constellation name=[[Coma Berenices]]|ra={{RA|13|30|37.6900}}|dec={{DEC|+25|09|10.878}}|z=1.055000|h_radial_v=316,281 [[kilometer per second|km/s]]|dist_ly=7.733 [[light years|Gly]]|appmag_v=17.67|appmag_b=18.31|type=CSS|names=[[Fourth Cambridge Survey|4C]] 25.43, DA 345, NRAO 424, [[Lyon-Meudon Extragalactic Database|LEDA]] 2817651, LHE 347, CTA 61, [[Quasar|QSO]] B1328+254|image=File:3C 287 SDSS image.jpg|caption=The quasar 3C 287.}}
'''3C 287''' is a [[quasar]] located in the [[constellation]] of [[Coma Berenices]]. It has a [[redshift]] of (z) 1.055,<ref name=":0">{{Cite journal |last1=Salvesen |first1=G. |last2=Miller |first2=J. M. |last3=Cackett |first3=E. |last4=Siemiginowska |first4=A. |date=2009-02-10 |title=A Deep XMM-Newton Observation of the Quasar 3C 287 |url=https://doi.org/10.1088/0004-637x/692/1/753 |journal=The Astrophysical Journal |volume=692 |issue=1 |pages=753–757 |doi=10.1088/0004-637x/692/1/753 |arxiv=0809.4691 |bibcode=2009ApJ...692..753S |issn=0004-637X}}</ref><ref>{{Cite journal |last1=Lehnert |first1=Matthew D. |last2=Miley |first2=George K. |last3=Sparks |first3=William B. |last4=Baum |first4=Stefi A. |last5=Biretta |first5=John |last6=Golombek |first6=Daniel |last7=de Koff |first7=Sigrid |last8=Macchetto |first8=Ferdinando D. |last9=McCarthy |first9=Patrick J. |date=August 1999 |title=Hubble Space Telescope – Snapshot Survey of 3CR Quasars: The Data |url=https://iopscience.iop.org/article/10.1086/313239/fulltext/ |journal=The Astrophysical Journal Supplement Series |volume=123 |issue=2 |pages=351–376 |doi=10.1086/313239 |bibcode=1999ApJS..123..351L |issn=0067-0049|url-access=subscription }}</ref> and such classified as a prototype compact steep spectrum source (CSS).<ref name=":1">{{Cite journal |last1=Fanti |first1=C. |last2=Fanti |first2=R. |last3=Parma |first3=P. |last4=Venturi |first4=T. |last5=Schilizzi |first5=R. T. |last6=Nan Rendong |last7=Spencer |first7=R. E. |last8=Muxlow |first8=T. W. B. |last9=van Breugel |first9=W. |date=1989-06-01 |title=Three prototype compact steep spectrum radio sources. |url=https://articles.adsabs.harvard.edu//full/1989A%26A...217...44F/0000044.000.html |journal=Astronomy and Astrophysics |volume=217 |pages=44–56 |bibcode=1989A&A...217...44F |issn=0004-6361}}</ref> This object was first discovered between January and February 1964 via a photographic [[Graph coloring|two-color]] technique.<ref>{{Cite journal |last1=Sandage |first1=Allan |last2=Wyndham |first2=John D. |date=1965-01-01 |title=On the Optical Identification of Eleven New Quasi-Stellar Radio Sources. |url=https://articles.adsabs.harvard.edu/pdf/1965ApJ...141..328S |journal=The Astrophysical Journal |volume=141 |pages=328 |doi=10.1086/148125 |bibcode=1965ApJ...141..328S |issn=0004-637X}}</ref>
== Description == 3C 287 is classified as radio-loud quasar with a [[Hertz|gigahertz]] peaked [[spectrum]].<ref name=":0" /> It is found to have [[Continuum mechanics|continuum]] [[Radio wave|radio emission]] in southwest direction, likely originating from either an [[Stellar classification|M-type star]] or an underlying [[galaxy]] that is located from the object.<ref>{{Cite journal |last1=Bremer |first1=M.N. |last2=Crawford |first2=C.S. |last3=Fabian |first3=A.C. |last4=Johnstone |first4=R.M. |date=1992 |title=Extended optical emission around radio-loud quasars at Z of about 1 |journal=Monthly Notices of the Royal Astronomical Society |volume=254 |pages=614–626|doi=10.1093/mnras/254.4.614 |doi-access=free |bibcode=1992MNRAS.254..614B }}</ref> It is a candidate precessing source, shown to have a position displacement between 2014 and 2017, likely caused by the brightening of a new component.<ref name=":2">{{Cite journal |last1=Paragi |first1=Z. |last2=Frey |first2=S. |last3=Sanghera |first3=H. S. |date=1998-10-01 |title=Is 3C 287 a precessing radio source? |url=https://articles.adsabs.harvard.edu/pdf/1998A%26A...338..840P |journal=Astronomy and Astrophysics |volume=338 |pages=840–842 |issn=0004-6361}}</ref><ref>{{Cite journal |last1=Titov |first1=Oleg |last2=Frey |first2=Sándor |last3=Melnikov |first3=Alexey |last4=Lambert |first4=Sébastien |last5=Shu |first5=Fengchun |last6=Xia |first6=Bo |last7=González |first7=Javier |last8=Tercero |first8=Belén |last9=Gulayev |first9=Sergey |last10=Weston |first10=Stuart |last11=Natusch |first11=Tim |date=2022-03-14 |title=Unprecedented change in the position of four radio sources |journal=Monthly Notices of the Royal Astronomical Society |volume=512 |issue=1 |pages=874–883 |doi=10.1093/mnras/stac038 |doi-access=free |issn=0035-8711|arxiv=2202.13119 }}</ref> A bright companion can be found southwest from the object.<ref>{{Cite journal |last1=Hilbert |first1=B. |last2=Chiaberge |first2=M. |last3=Kotyla |first3=J. P. |last4=Tremblay |first4=G. R. |last5=Stanghellini |first5=C. |last6=Sparks |first6=W. B. |last7=Baum |first7=S. |last8=Capetti |first8=A. |last9=Macchetto |first9=F. D. |last10=Miley |first10=G. K. |last11=O’Dea |first11=C. P. |last12=Perlman |first12=E. S. |last13=Quillen |first13=A. |date=2016-07-01 |title=Powerful Activity in the Bright Ages. I. A Visible/IR Survey of High Redshift 3C Radio Galaxies and Quasars |journal=The Astrophysical Journal Supplement Series |volume=225 |issue=1 |pages=12 |doi=10.3847/0067-0049/225/1/12 |doi-access=free |arxiv=1605.03196 |bibcode=2016ApJS..225...12H |issn=0067-0049}}</ref>
The radio source of 3C 287 is compact with no signs of a secondary structure.<ref>{{Cite journal |last1=Pearson |first1=T. J. |last2=Readhead |first2=A. C. S. |last3=Perley |first3=R. A. |date=May 1985 |title=Compact radio sources in the 3C catalog |url=https://articles.adsabs.harvard.edu//full/1985AJ.....90..738P/0000745.000.html |journal=The Astronomical Journal |volume=90 |pages=738 |doi=10.1086/113782 |bibcode=1985AJ.....90..738P |issn=0004-6256}}</ref> Based on radio mapping images made by [[Very-long-baseline interferometry|very long baseline interferometry]] (VLBI) and [[MERLIN]], it contains several filamentary structures located both west and southwest directions, hinting the continuation of a [[spiral]] pattern.<ref>{{Cite journal |last1=Nan |first1=R. |last2=Schilizzi |first2=R. T. |last3=Fanti |first3=C. |last4=Fanti |first4=R. |last5=van Breugel |first5=W. J. M. |last6=Muxlow |first6=T. W. |date=1988-01-01 |title=The Radio Structures of the Compact Steep Spectrum Sources 3C119, 3C287, and 3C343 |url=https://articles.adsabs.harvard.edu//full/1988IAUS..129..119R/0000119.000.html |journal=The Impact of VLBI on Astrophysics and Geophysics; Proceedings of the 129th IAU Symposium, Cambridge, MA, May 10-15, 1987 |volume=129 |pages=119|bibcode=1988IAUS..129..119R }}</ref> There is a bright compact component located in the center of the source, revealed to be a small radio core whose extent is measured lower than 4 [[Minute and second of arc|milliarcseconds]].<ref name=":0" /><ref name=":1" /> There is a curved [[Astrophysical jet|jet]]. At both frequencies, the [[brightness]] of the source exhibits a decrease with its two-point [[spectral index]] showing a shift from 0.5 to 1.5 along a ridge line.<ref name=":1" /><ref name=":2" /> Radio polarimetric observations taken by [[Very Long Baseline Array]] (VLBA) at sub-arcsecond resolutions, showed the source is classified as point-like. There is a much weaker extension located in the south.<ref>{{Cite journal |last1=Mantovani |first1=F. |last2=Rossetti |first2=A. |last3=Junor |first3=W. |last4=Saikia |first4=D. J. |last5=Salter |first5=C. J. |date=2013-06-18 |title=Radio polarimetry of compact steep spectrum sources at sub-arcsecond resolution |url=https://doi.org/10.1051/0004-6361/201220769 |journal=Astronomy & Astrophysics |volume=555 |pages=A4 |doi=10.1051/0004-6361/201220769 |arxiv=1305.1644 |bibcode=2013A&A...555A...4M |issn=0004-6361}}</ref>
X-band [[Polarimetry|polarimetric]] observations of 3C 287 captured by VLBA, found most of the [[Polarization (waves)|polarized]] emission originated from the brightest region. Based on results, its [[magnetic field]] geometry is found complex exhibiting a 90° on a milliarcsecond scale.<ref>{{Cite journal |last1=Dallacasa |first1=D. |last2=Schilizzi |first2=R. T. |last3=Rendong |first3=Nan |date=1998 |title=X-Band VLBA Polarization of 3C 287 |url=https://articles.adsabs.harvard.edu//full/1998ASPC..144..117D/0000117.000.html |journal=International Astronomical Union Colloquium |volume=164 |pages=117–118 |doi=10.1017/s025292110004478x |bibcode=1998ASPC..144..117D |issn=0252-9211}}</ref>
== References == <references />
== External links == *[http://simbad.u-strasbg.fr/simbad/sim-id?bibyear1=1850&bibyear2=%24currentYear&submit=Display&Ident=%402159761&Name=7C+132816.2%2B252436&bibdisplay=refsum&bibyear1=1850&bibyear2=%24currentYear#lab_bib 3C 287 on SIMBAD] *[http://ned.ipac.caltech.edu/cgi-bin/objsearch?search_type=Obj_id&objid=63377&objname=1&img_stamp=YES&hconst=73.0&omegam=0.27&omegav=0.73&corr_z=1 3C 287 on NASA/IPAC Database]
{{Coma Berenices}} [[Category:3C objects|287]] [[Category:Quasars]] [[Category:Coma Berenices]] [[Category:4C objects|25.43]] [[Category:LEDA objects|2817651]] [[Category:Active galaxies]] [[Category:Astronomical objects discovered in 1964]]